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<p>The dissolution of carbonate rocks under deep burial conditions significantly impacts reservoir quality. This study simulated the dissolution of carbonate rocks in an acidic environment using a homemade device that combined macroscopic mechanical tests and microscopic characterizations to investigate pore evolution and fractal characteristics. The results suggest that dissolution alters pore structure by widening primary fractures, promoting interconnection, and generating secondary fractures. This enhances pore connectivity. The macropore fractal dimension (<i>D</i><sub>1</sub>) decreases with dissolution time, while the mesopore (<i>D</i><sub>2</sub>) and micropore (<i>D</i><sub>3</sub>) fractal dimensions increase, All fractal dimensions range from 2 to 3. Fractal dimensions strongly correlate with reservoir properties, with higher values indicating more complex micropores. Under constant pore and confining pressures, peak strength decreases and strain increases with prolonged dissolution. Calcite is more soluble than dolomite; specific surface area and porosity positively correlate with dissolution time. These results provide a theoretical basis for understanding carbonate dissolution pores and technical support for engineering projects in carbonate areas.</p>

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Fractal Characterization of Pore Structure and Mechanical Degradation in Carbonate Rocks Under Acid Dissolution

  • 期刊论文

  • 发表日期：

    2025年8月30日

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  • Xin Liu,
  • Chen Wang,
  • Ting Lu,
  • Xiaosong Wen,
  • Zichen Li,
  • Yujun Zuo

摘要

The dissolution of carbonate rocks under deep burial conditions significantly impacts reservoir quality. This study simulated the dissolution of carbonate rocks in an acidic environment using a homemade device that combined macroscopic mechanical tests and microscopic characterizations to investigate pore evolution and fractal characteristics. The results suggest that dissolution alters pore structure by widening primary fractures, promoting interconnection, and generating secondary fractures. This enhances pore connectivity. The macropore fractal dimension (D1) decreases with dissolution time, while the mesopore (D2) and micropore (D3) fractal dimensions increase, All fractal dimensions range from 2 to 3. Fractal dimensions strongly correlate with reservoir properties, with higher values indicating more complex micropores. Under constant pore and confining pressures, peak strength decreases and strain increases with prolonged dissolution. Calcite is more soluble than dolomite; specific surface area and porosity positively correlate with dissolution time. These results provide a theoretical basis for understanding carbonate dissolution pores and technical support for engineering projects in carbonate areas.